Description
The authors conducted isotopic (18O/16O and 13C/12C) and elemental chemical analyses (Sr/Ca and Mg/Ca ratios) of sediment cores taken from Petaluma Marsh, San Francisco Bay, Northern California, USA (~38.2°N, 122.55°W), in an effort to reconstruct a record of paleoenvironmental change in this region over the past 700 years. Higher δ18O and Mg/Ca values were discovered between 600 and 700 cal yr BP, indicating "drier and warmer conditions during the end of the Medieval Warm Period."